This vintage hard plastic ball is used for crochet string or yarn to help prevent the string / yarn from unraveling or knotting. Probably from the 50s.
It comes in two halves allowing the string or yarn to be placed inside and threaded through a hole in the beige half to prevent the threads from knotting. The red half has a round base to keep the ball from rolling and a sleeve around its diameter to hold the beige half in place. It has a F.W.Woolworth sticker tag on bottom.
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